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arXiv 0908.0194hep-ph
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QCD相边界和临界点的袋模型计算

QCD Phase Boundary and Critical Point in a Bag Model Calculation

C. P. Singh, P. K. Srivastava, S. K. Tiwari

摘要:

临界点的定位和QCD相界的映射仍然是重离子物理中最有趣和最受关注的问题之一。本文提出了一个新的扩展重子和点状介子气体的状态方程,它考虑了重子几何尺寸引起的排斥性硬核相互作用。利用Gibbs平衡判据和袋模型状态方程,得到了弱相互作用夸克物质的一级退凝相变。有趣的是,发现相变线终止于临界点,超过临界点,热密介子气体和夸克-反夸克胶子物质之间存在交叉区。我们的曲线在形状上与现有格点规范计算的预测非常相似,并且也再现了束缚相界。

英文摘要:

Location of critical point and mapping the QCD phase boundary still exists as one of the most interesting and studied problems of heavy-ion physics. A new equation of state (EOS) for a gas of extended baryons and pointlike mesons is presented here which accounts for the repulsive hard-core interactions arising due to the geometrical size of the baryons. A first order deconfining phase transition is obtained using Gibbs' equilibrium criteria and a bag model EOS for the weakly interacting quark matter. It is interesting to find that the phase transition line ends at a critical point beyond which a cross-over region exists between hot-dense meson gas and quark-antiquark gluon matter. Our curve resembles in shape closely with the predictions of the available lattice gauge calculations and also reproduces the conjectured phase boundary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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